FIELD: polymer production. SUBSTANCE: copolymers are prepared by heterofunctional polycondensation of polyphenylsesquioxane of formula I: 
(I), wherein R is phenyl and m= 3-10, with dichloropolydiorganosiloxane of formula Cl[(R′)2SiO]n(R′)2SiCl, wherein R' is methyl and phenyl and n=160-250, in organic solvent in presence of hydrogen chloride accepting base added when polycondensation is completed, followed by ageing for 40-80 C. EFFECT: achieved elasticity and heat resistance of vulcanizate. 1 tbl, 5 ex
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